Artifact c7d6752b6dc5e18e244c428d7519f2d1f8efd32ceb7b060cf248893b78de7a61:

• File psl-1983/emode/vt100.sl — part of check-in [eb17ceb7f6] at 2020-04-21 19:40:01 on branch master — Add Reduce 3.0 to the historical section of the archive, and some more
  files relating to version sof PSL from the early 1980s. Thanks are due to
  Paul McJones and Nelson Beebe for these, as well as to all the original
  authors.

  git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@5328 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 1619) [annotate] [blame] [check-ins using] [more...]

%
% VT100.SL - EMODE support for VT100 terminals
% 
% Author:      William F. Galway
%              Symbolic Computation Group
%              Computer Science Dept.
%              University of Utah
% Date:        27 June 1982
% Copyright (c) 1982 University of Utah
%

% Screen starts at (0,0), and other corner is offset by (79,23)  (total
% dimensions are 80 wide by 24 down)
(setf ScreenBase (Coords 0 0))
(setf ScreenDelta (Coords 79 23))

% Parity mask is used to clear "parity bit" for those terminals that don't
% have a meta key.  It should be 8#177 in that case.  Should be 8#377 for
% terminals with a meta key.
(setf parity_mask 8#177)

(DE EraseScreen ()
  (progn
    % First, erase the screen
    (PBOUT (Char ESC))
    (PBOUT (Char ![))
    (PBOUT (Char 2))
    (PBOUT (Char J))

    % Then make sure the cursor's at home.
    (SetTerminalCursor 0 0)
    ))

(DE Ding ()
  (PBOUT (Char Bell)))

% Clear to end of line from current position (inclusive).
(DE TerminalClearEol ()
  (progn
    (PBOUT (Char ESC))
    (PBOUT (Char ![))
    (PBOUT (Char K))))

% Move physical cursor to Column,Row
(DE SetTerminalCursor (ColLoc RowLoc)
  (progn
    (PBOUT (char ESC))
    (PBOUT (Char ![))
    % Use "quick and dirty" conversion to decimal digits.
    (PBOUT (plus (char 0) (quotient (add1 RowLoc) 10)))
    (PBOUT (plus (char 0) (remainder (add1 RowLoc) 10)))

    % Delimiter between row digits and column digits.
    (PBOUT (char !;))

    (PBOUT (plus (char 0) (quotient (add1 ColLoc) 10)))
    (PBOUT (plus (char 0) (remainder (add1 ColLoc) 10)))

    (PBOUT (char H))     % Terminate the sequence
    ))